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In a medium bowl, whisk the first 4 ingredients. In a large bowl using an electric mixer on medium-high, beat the butter until light and fluffy, about 2 minutes. Add the sugar; beat to blend. Beat in the egg and vanilla, then the sour cream. Add the flour mixture; beat on low until just blended. Halve the dough; shape into disks. Wrap in plastic and chill until firm, 1 1/2 to 2 hours.
Preheat the oven to 375 degrees . Roll dough into balls, roll in colored sugar; divide between two large parchment-lined baking sheets. Press slightly to flatten.
Bake until the bottoms of the cookies are light golden, 6 to 7 minutes. Transfer to a rack; let cool.